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-rw-r--r--vm_trace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm_trace.c b/vm_trace.c
index 80084019e4..65a53d4d04 100644
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -700,7 +700,7 @@ symbol2event_flag(VALUE v)
#undef C
CONST_ID(id, "a_call"); if (sym == ID2SYM(id)) return RUBY_EVENT_CALL | RUBY_EVENT_B_CALL | RUBY_EVENT_C_CALL;
CONST_ID(id, "a_return"); if (sym == ID2SYM(id)) return RUBY_EVENT_RETURN | RUBY_EVENT_B_RETURN | RUBY_EVENT_C_RETURN;
- rb_raise(rb_eArgError, "unknown event: %s", rb_id2name(SYM2ID(sym)));
+ rb_raise(rb_eArgError, "unknown event: %"PRIsVALUE, rb_sym2str(sym));
}
static rb_tp_t *